diff --git a/Api/Extension/AdminSaleUnitScopeExtension.php b/Api/Extension/AdminSaleUnitScopeExtension.php
new file mode 100644
index 0000000..26c50c3
--- /dev/null
+++ b/Api/Extension/AdminSaleUnitScopeExtension.php
@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OrderComment\Api\Extension;
+
+use ApiPlatform\Metadata\HttpOperation;
+use ApiPlatform\Metadata\Operation;
+use OrderComment\Api\Resource\OrderComment;
+use OrderComment\Model\Map\OrderCommentTableMap;
+use Propel\Runtime\ActiveQuery\Criteria;
+use Propel\Runtime\ActiveQuery\ModelCriteria;
+use Thelia\Api\Bridge\Propel\Extension\QueryCollectionExtensionInterface;
+use Thelia\Api\Bridge\Propel\Extension\QueryItemExtensionInterface;
+use Thelia\Domain\SaleUnit\Access\AdminSaleUnitScope;
+
+/**
+ * Narrows the admin order comments of an administrator restricted to some sale
+ * units to the comments of the orders placed on those units. Collections lose the
+ * other rows and an item out of reach answers 404, as for the orders themselves.
+ *
+ * An administrator attached to no unit, and a superadministrator, see everything.
+ * A comment on a national order (no unit) belongs to none of a restricted
+ * administrator's units, so it is left out.
+ */
+final readonly class AdminSaleUnitScopeExtension implements QueryCollectionExtensionInterface, QueryItemExtensionInterface
+{
+    public function __construct(private AdminSaleUnitScope $scope)
+    {
+    }
+
+    public function applyToCollection(ModelCriteria $query, string $resourceClass, ?Operation $operation = null, array $context = []): void
+    {
+        $this->restrict($query, $resourceClass, $operation);
+    }
+
+    public function applyToItem(ModelCriteria $query, string $resourceClass, ?Operation $operation = null, array $context = []): void
+    {
+        $this->restrict($query, $resourceClass, $operation);
+    }
+
+    private function restrict(ModelCriteria $query, string $resourceClass, ?Operation $operation): void
+    {
+        if (OrderComment::class !== $resourceClass) {
+            return;
+        }
+
+        if (!$operation instanceof HttpOperation || !str_starts_with($operation->getUriTemplate() ?? '', '/admin')) {
+            return;
+        }
+
+        $allowed = $this->scope->allowedSaleUnitIds();
+
+        if (null === $allowed) {
+            return;
+        }
+
+        // The ids are integers read from the database, never from the request.
+        $query->addAnd(OrderCommentTableMap::COL_ORDER_ID, \sprintf(
+            '%s IN (SELECT `order`.`id` FROM `order` WHERE `order`.`sale_unit_id` IN (%s))',
+            OrderCommentTableMap::COL_ORDER_ID,
+            implode(',', array_map('intval', $allowed)) ?: 'NULL',
+        ), Criteria::CUSTOM);
+    }
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..7506d51
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,14 @@
+# Changelog
+
+## 3.1.1
+
+### Fixed
+
+- The admin `order-comments` API collection is restricted to the comments of the orders placed on the sale units of an administrator restricted to some units (a comment on a national order is left out). An administrator attached to no unit and a superadministrator are unchanged.
+- The `order-comments` admin resource now declares its permission (the order one) in `thelia.api.admin_resources`; without it the admin API refuses every non-super administrator.
+
+### Changed
+
+- The admin permission of the resource is added to `thelia.api.admin_resources` by a compiler pass, so it never erases what another module declared.
+
+- Requires `thelia/core` 3.3.0 or later (sale unit scope).
diff --git a/Config/module.xml b/Config/module.xml
index 78d6305..e039047 100644
--- a/Config/module.xml
+++ b/Config/module.xml
@@ -7,12 +7,12 @@
     <descriptive locale="fr_FR">
         <title>Permet au client d'ajouter un commentaire à sa commande</title>
     </descriptive>
-    <version>3.1.0</version>
+    <version>3.1.1</version>
     <author>
         <name>Vincent Lopes-Vicente</name>
         <email>vlopes@openstudio.fr</email>
     </author>
     <type>classic</type>
-    <thelia>3.0.0</thelia>
+    <thelia>3.3.0</thelia>
     <stability>prod</stability>
 </module>
diff --git a/DependencyInjection/AdminApiResourcesPass.php b/DependencyInjection/AdminApiResourcesPass.php
new file mode 100644
index 0000000..3aebb5d
--- /dev/null
+++ b/DependencyInjection/AdminApiResourcesPass.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OrderComment\DependencyInjection;
+
+use OrderComment\Api\Resource\OrderComment as OrderCommentResource;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Thelia\Core\Security\Resource\AdminResources;
+
+/**
+ * Gives the order comments the order permission: an order comment is shown on the order.
+ * Without an entry in `thelia.api.admin_resources`, the admin API refuses the endpoint to
+ * every administrator but a superadministrator.
+ *
+ * Merged rather than set: the parameter is one array shared by every module publishing
+ * admin resources, and setting it would erase the others.
+ */
+final readonly class AdminApiResourcesPass implements CompilerPassInterface
+{
+    private const PARAMETER = 'thelia.api.admin_resources';
+
+    public function process(ContainerBuilder $container): void
+    {
+        $declared = $container->hasParameter(self::PARAMETER) ? (array) $container->getParameter(self::PARAMETER) : [];
+
+        $container->setParameter(self::PARAMETER, [
+            ...$declared,
+            OrderCommentResource::class => AdminResources::ORDER,
+        ]);
+    }
+}
diff --git a/OrderComment.php b/OrderComment.php
index f827178..5dcbb0d 100644
--- a/OrderComment.php
+++ b/OrderComment.php
@@ -21,6 +21,7 @@
 
 use OrderComment\Model\OrderCommentQuery;
 use Propel\Runtime\Connection\ConnectionInterface;
+use OrderComment\DependencyInjection\AdminApiResourcesPass;
 use Symfony\Component\DependencyInjection\Loader\Configurator\ServicesConfigurator;
 use Thelia\Core\Install\Database;
 use Thelia\Module\BaseModule;
@@ -39,10 +40,15 @@ public function postActivation(?ConnectionInterface $con = null): void
         }
     }
 
+    public static function getCompilers(): array
+    {
+        return [new AdminApiResourcesPass()];
+    }
+
     public static function configureServices(ServicesConfigurator $servicesConfigurator): void
     {
         $servicesConfigurator->load(self::getModuleCode().'\\', __DIR__)
-            ->exclude([__DIR__.'/I18n/*'])
+            ->exclude([__DIR__.'/I18n/*', __DIR__.'/Tests/*'])
             ->autowire()
             ->autoconfigure();
     }
diff --git a/Tests/Integration/AdminOrderCommentSaleUnitScopeTest.php b/Tests/Integration/AdminOrderCommentSaleUnitScopeTest.php
new file mode 100644
index 0000000..abab35e
--- /dev/null
+++ b/Tests/Integration/AdminOrderCommentSaleUnitScopeTest.php
@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OrderComment\Tests\Integration;
+
+use OrderComment\Model\OrderComment;
+use Thelia\Core\Security\AccessManager;
+use Thelia\Core\Security\Resource\AdminResources;
+use Thelia\Domain\SaleUnit\Access\AdminSaleUnitScope;
+use Thelia\Test\ApiTestCase;
+
+/**
+ * The admin order comments of an administrator restricted to some sale units are
+ * those of the orders placed on them.
+ */
+final class AdminOrderCommentSaleUnitScopeTest extends ApiTestCase
+{
+    private int $mine;
+    private int $theirs;
+    private int $national;
+    private string $restrictedToken;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $factory = $this->createFixtureFactory();
+        $first = $factory->saleUnit();
+        $second = $factory->saleUnit();
+        $connection = $this->getPropelConnection();
+
+        $myOrder = $factory->order()->setSaleUnitId($first->getId());
+        $myOrder->save($connection);
+        $theirOrder = $factory->order()->setSaleUnitId($second->getId());
+        $theirOrder->save($connection);
+        $nationalOrder = $factory->order();
+
+        $this->mine = $this->comment($myOrder->getId());
+        $this->theirs = $this->comment($theirOrder->getId());
+        $this->national = $this->comment($nationalOrder->getId());
+
+        $restricted = $factory->restrictedAdmin(
+            [AdminResources::ORDER => [AccessManager::VIEW]],
+            ['password' => 'password'],
+        );
+        $factory->adminSaleUnit($restricted, $first);
+        $this->restrictedToken = $this->authenticateAsAdmin($restricted);
+    }
+
+    protected function tearDown(): void
+    {
+        $this->getService(AdminSaleUnitScope::class)->reset();
+
+        parent::tearDown();
+    }
+
+    public function testARestrictedAdministratorReadsTheCommentsOfItsUnitsOnly(): void
+    {
+        self::assertSame([$this->mine], $this->listedIds($this->restrictedToken, [$this->mine, $this->theirs, $this->national]));
+    }
+
+    public function testAnAdministratorOfNoUnitReadsEverything(): void
+    {
+        $ids = $this->listedIds($this->authenticateAsAdmin(), [$this->mine, $this->theirs, $this->national]);
+
+        self::assertSame([$this->mine, $this->theirs, $this->national], $ids);
+    }
+
+    private function comment(int $orderId): int
+    {
+        $comment = (new OrderComment())->setOrderId($orderId)->setComment('comment');
+        $comment->save($this->getPropelConnection());
+
+        return $comment->getId();
+    }
+
+    /**
+     * @param list<int> $among
+     *
+     * @return list<int>
+     */
+    private function listedIds(string $token, array $among): array
+    {
+        $response = $this->jsonRequest('GET', '/api/admin/order-comments', token: $token, format: 'json');
+
+        self::assertSame(200, $response->getStatusCode(), (string) $response->getContent());
+
+        $ids = array_map(
+            static fn (array $row): int => (int) $row['id'],
+            json_decode((string) $response->getContent(), true, flags: \JSON_THROW_ON_ERROR),
+        );
+        $ids = array_values(array_intersect($ids, $among));
+        sort($ids);
+
+        return $ids;
+    }
+}
diff --git a/Tests/Integration/AdminResourcesDeclarationTest.php b/Tests/Integration/AdminResourcesDeclarationTest.php
new file mode 100644
index 0000000..978321f
--- /dev/null
+++ b/Tests/Integration/AdminResourcesDeclarationTest.php
@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OrderComment\Tests\Integration;
+
+use OrderComment\Api\Resource\OrderComment as OrderCommentResource;
+use OrderComment\OrderComment;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Thelia\Core\Security\Resource\AdminResources;
+
+/**
+ * The "thelia.api.admin_resources" parameter is shared by every module that publishes
+ * admin resources: the module adds its own to what is already declared.
+ */
+final class AdminResourcesDeclarationTest extends TestCase
+{
+    public function testTheResourceIsAddedToWhatAnotherModuleDeclared(): void
+    {
+        $container = new ContainerBuilder();
+        $container->setParameter('thelia.api.admin_resources', ['Other\\Resource' => AdminResources::MODULE]);
+
+        foreach (OrderComment::getCompilers() as $pass) {
+            $pass->process($container);
+        }
+
+        self::assertSame(
+            ['Other\\Resource' => AdminResources::MODULE, OrderCommentResource::class => AdminResources::ORDER],
+            $container->getParameter('thelia.api.admin_resources'),
+        );
+    }
+
+    public function testTheResourceIsDeclaredWhenNoOtherModuleDeclaresAny(): void
+    {
+        $container = new ContainerBuilder();
+
+        foreach (OrderComment::getCompilers() as $pass) {
+            $pass->process($container);
+        }
+
+        self::assertSame(
+            [OrderCommentResource::class => AdminResources::ORDER],
+            $container->getParameter('thelia.api.admin_resources'),
+        );
+    }
+}
diff --git a/composer.json b/composer.json
index 8a86fb2..5161cc6 100644
--- a/composer.json
+++ b/composer.json
@@ -3,6 +3,7 @@
   "license": "GPL-3.0-or-later",
   "type": "thelia-module",
   "require": {
+    "thelia/core": ">=3.3.0",
     "thelia/installer": "^1.6"
   },
   "extra": {